Echo JS 0.11.0

`arguments` is basically deprecated in favour of rest parameters in ES6. `arguments` doesn't even exist in arrow functions. [0]

Also, the new spread operator means you will rarely need to use .apply(). [1]

[0](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/rest_parameters)

[1](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator)